Hello,

Now, you are in 11th class . So, you have approx 1 year for preparation for JEE Mains 2021 . It's not too late to start . You have to stay focus and study according to your self prepared timetable . According to me , you should give more time to self study.You should study everyday and revise each and every topic thoroughly . There are various books for JEE Mains preparation. T

Some of the books which are good for JEE are listed below :

Physics - H.C Verma and NCERT

Chemistry - Modern Approach to Chemical Calculations by R.C. Mukherjee and NCERT

Matchematics  - Objective Mathematics by R D Sharma and NCERT

You can also visit the below link for detailed list of books for JEE main :

https://engineering.careers360.com/articles/best-books-for-jee-main

Best of Luck